Knee support



FIG. 1 is a front perspective view of a knee support showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a rear perspective view of the knee support showing my new design; and,

FIG. 5 is a perspective view of the knee support sleeved on a knee of a leg.

The broken lines showing represents environmental structure and forms no part of the claimed design. 

CLAIM The ornamental design for a knee support, as shown and described. 